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| Kohyama, K., K.Y. Kim, N. Shibuya, K. Nishinari, and A. Tsutsumi. 1992. Dielectric, viscoelastic and broad-line NMR study of konjac glucomannan films. Carbohydrate Polymers 17: 59-63. | to Top |
Abstract Complex dielectric coefficients and elastic moduli of konjac glucomannan (KGM) were observed at 10 HZ in the temperature range from -180 to 150C. Broad-line NMR measurements were also carried out over the same temperture range. Mechanical and dielectric loss peaks at -100C were attributed to the rotational motion of hydroxymethyl group attaached to the C-5 atom in glucose and mannose residues. The second moment of KGM decreased rapidly around temperatures at 0C and at -60C. These temperatures are higher than those found in amylose, pullulan and dextran indicating the movements of hydroxymethyl groups are hindered in KGM.
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